exploring planets and earth
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Exploring Planets and Earth. Yuk Ling Yung Caltech. Venus (Stability of CO2 atmosphere) McElroy, Sze and Yung 1973 Yung and DeMore Icarus 1982 CO2 is unstable against UV A tiny amount of Cl (< 1ppm) Catalytically oxidizes CO back to CO2 via the peroxychloroformyl - PowerPoint PPT PresentationTRANSCRIPT
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Exploring Planets and Earth
Yuk Ling Yung
Caltech
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Venus (Stability of CO2 atmosphere)
McElroy, Sze and Yung 1973Yung and DeMore Icarus 1982
CO2 is unstable against UV
A tiny amount of Cl (< 1ppm)Catalytically oxidizes CO back to CO2 via the peroxychloroformyl radical (ClCO3)
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Titan = Prebiotic Earth?
Titan: Moon of Saturn
1.5 bar N2, 95K
Yung et al 1984
Organic synthesis
CH4 + UV = CxHy
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C2H6 Lakes predicted by Lunine, Stevenson and Yung 1983; observed by Cassini 2010
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Global Climate Change
Three leading anthropogenic greenhouse gases
CO2
CH4
N2O
Habitability
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Wang, Yung et al. 1976
Yung et al. 1976
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First global map of CO2 from AURA satellite
Chahine, .. Yung, 2008
V2x
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Li, …Yung 2009Time 15 June 2009
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